1
JEE Advanced 2020 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
A circular coil of radius R and N turns has negligible resistance. As shown in the schematic figure,
its two ends are connected to two wires and it is hanging by those wires with its plane being vertical.
The wires are connected to a capacitor with charge Q through a switch. The coil is in a horizontal
uniform magnetic field Bo parallel to the plane of the coil. When the switch is closed, the capacitor
gets discharged through the coil in a very short time. By the time the capacitor is discharged fully,
magnitude of the angular momentum gained by the coil will be (assume that the discharge time is so
short that the coil has hardly rotated during this time)


2
JEE Advanced 2020 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate
about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away
from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic
and not drawn to scale)


3
JEE Advanced 2017 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-0.75
A symmetric star shaped conducting wire loop is carrying a steady state current $${\rm I}$$ as shown in the figure. The distance between the diametrically opposite vertices of the star is $$4a.$$ The magnitude of the magnetic field at the center of the loop is

4
JEE Advanced 2017 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-0.75
A charged particle (electron or proton) is introduced at the origin (x=0,y=0,z=0) with a given initial velocity $$\overrightarrow v .$$ A uniform electric field $$\overrightarrow E $$ and a uniform magnetic field $$\overrightarrow B $$ exist everywhere. The velocity $$\overrightarrow v ,$$ electric field $$\overrightarrow E $$ and magnetic field $$\overrightarrow B $$ are given in column $$1,2$$ and $$3,$$ respectively. The quantities $${E_0},{B_0}$$ are positive in magnitude.
Column 1 | Column 2 | Column 3 | |||
---|---|---|---|---|---|
(I) | Electron with $$\overrightarrow v = 2{{{E_0}} \over {{B_0}}}\widehat x$$ | (i) | $$\overrightarrow E = {E_0}\widehat z$$ | (P) | $$\overrightarrow B = - {B_0}\widehat x$$ |
(II) | Electron with $$\overrightarrow v = {{{E_0}} \over {{B_0}}}\widehat y$$ | (ii) | $$\overrightarrow E = - {E_0}\widehat y$$ | (Q) | $$\overrightarrow B = {B_0}\widehat x$$ |
(III) | Proton with $$\overrightarrow v = 0$$ | (iii) | $$\overrightarrow E = - {E_0}\widehat x$$ | (R) | $$\overrightarrow B = {B_0}\widehat y$$ |
(IV) | Proton with $$\overrightarrow v = 2{{{E_0}} \over {{B_0}}}\widehat x$$ | (iv) | $$\overrightarrow E = {E_0}\widehat x$$ | (S) | $$\overrightarrow B = {B_0}\widehat z$$ |
In which case will the particle move in a straight line with constant velocity?
Questions Asked from Magnetism (MCQ (Single Correct Answer))
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